john deere 1055 combine pump repair , Iran

The hydraulic pump of the John Deere 1055 combine is typically a vane or piston type with a flow capacity of around 70 to 90 liters per minute. This pump can generate an operating pressure of up to 220 bar and is responsible for supplying hydraulic oil to the lifting cylinders, steering system, and auxiliary mechanisms. Proper selection of pump type and maintaining the required flow rate are essential to prevent efficiency loss and excessive system temperature rise.

The mounting location of the John Deere 1055 hydraulic pump is usually at the front section of the engine, aligned with the power transmission coupling. This placement allows direct mechanical power transfer from the engine and is connected via a flange or flexible coupling to the output shaft. High-pressure hoses and return lines to the hydraulic reservoir are also attached here, making accurate sealing of all joints critical to reliable operation.

The repair process of the John Deere 1055 hydraulic pump involves disassembling the unit, inspecting vane or piston wear, and checking bearings using precision tools such as micrometers. If scratches or tolerance deviations greater than 0.05 millimeters are detected, the component must be replaced. After reassembly, a pressure test on a hydraulic test bench is performed at up to 250 bar and 70 liters per minute flow rate. This test ensures proper sealing performance and verifies that the pump can deliver the required pressure for field operation.
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